RT9241CS datasheet(7/13 Pages) ETC

7 / 13 page

Preliminary

RT9241

DS9241-00 November 2001

www.richtek-ic.com.tw

Functional Pin Description

VID4, VID3, VID2, VID1 and VID0 ( Pin1,2,3,4,5)

DAC voltage identification inputs for VRM9.0. These

pins are TTL-compatible and internally pulled to VDD

if left open.

COMP (Pin 6)

Output of the error amplifier and input of the PWM

comparator.

FB (Pin 7)

Inverting input of the internal error amplifier.

ADJ (Pin 8)

Current sense output for active droop adjust. Connect

a resistor from this pin to GND to set the amount of

load droop.

DVD (Pin 9)

Programmable power UVLO detection input. Trip

threshold = 1.25V at V(DVD) rising

SS (Pin 10)

Connect this SS pin to GND with a capacitor to set

the start time interval. Pull this pin below 1V(ramp

valley of saw-tooth wave in pulse width modulator) to

shutdown the converter output.

ISEN1 (Pin 12), ISEN2 (Pin 11)

Current sense inputs from the individual converter

channel’s sense component GND nodes.

GND (Pin 13)

Ground for the IC.

VSEN (Pin 14)

Power good and over voltage monitor input. Connect

to the microprocessor-CORE voltage.

ISP1 (Pin 18), ISEN2 (Pin 15)

Current sense

inputs

for

individual

converter

channels. Tie this pin to the component sense node.

PWM1 (Pin 17), PWM2 (Pin 16)

PWM outputs for each driven channel. Connect these

pins to the PWM input of the MOSFET driver.

PGOOD (Pin 19)

Power good open-drain output.

VDD (Pin 20)

IC power supply. Connect this pin to a 5V supply.

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